Year	Number of
1990	407.7
1991	420.56
1992	441.72
1993	462.81
1994	490.09
1995	512.25
1996	527.35
1997	548.36
1998	573.39
1999	579.86
2000	580.44
2001	568.6
2002	561.91
2003	576.07
2004	581.9
2005	592.71
2006	612.53
2007	636.71
2008	662.97
2009	692.46
2010	715.81
2011	744.26
2012	776.03
2013	822.17
2014	862.91
2015	903.74
2016	944.37